Conhecimento especializado do professor que ensina matemática relativo ao tópico de divisão

Considering teachers’ knowledge plays a central role in their practice and on students’ learning, and as the division is one of the most problematic topic for teachers’ and students’, we focus our attention on the content of kindergarten and primary teachers’ specialized knowledge who participated of a teacher education program in Brazil, related to such topic. Data concerns teachers’ interactions when discussing a task and was analysed according to the Mathematics Teachers’ Specialized Knowledge perspective to characterize the content of such a knowledge on division. From the analysis, emerged a set of descriptors of teachers’ specialized knowledge related to concepts, procedures, properties, foundations and systems of representation in the scope of division. It contributes to improve the way teachers’ training programs are conceptualized, providing elements to intentionally implement effective instruments for the development of such a teacher’s knowledge.